Organic Thermoelectric Materials by Lin Zhiqun;He Ming;

Author:Lin, Zhiqun;He, Ming; [Неизв.]
Language: eng
Format: epub
ISBN: 9781788019163
Publisher: Book Network Int'l Limited trading as NBN International (NBNi)
Published: 2019-07-26T21:00:00+00:00

5.3.3 Improved TE Properties by CNT Composites

CNT have also been used as fillers to make composite TE materials. Different types of CNT are being used in varying amounts to get better TE properties. A few of these reports have been mentioned here and the effects of dispersed CNT on TE properties are mostly a trade-off between the electrical conductivity and the thermal conductivity. The ZT of an individual MWCNT is reported by Miao et al. 71 They have used the T-type method developed for evaluating the TE performance of 1D materials by Ma et al. 72 As shown in Figure 5.14, there are two heat sinks, A and D, and a nano-Pt sensor is suspended between them. Other than that, there are another four heat sinks B, C, E, F. MWCNT is attached on the one end to the Pt sensor and other end to the heat sink to make a T shape. Heat sinks A and D are used to apply the dc heating current, and heat sinks B and C are used to measure the dc voltage. Thermal conductivity is measured by heat current from nanofilm sensor, which also acts as heater, to the heat sink B and C via the MWCNT. The electrical conductivity of the MWCNT is measured by applying a dc current at heat sinks A and E and measuring the voltage developed at heat sinks C and F. Owing to the very high thermal conductivity of around 769.3 W mK−1, the maximum ZT is reported 1.32 × 10−6 at 420 K.

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